i don't have an ion , but normaly when switching on unison you put more oscillators under one key . so when you play you would get a broader, sound while yu hear the oscillators all together and slightly detuned
often the grade of detuning can be adjusted too.
greetings sunny

I don't have an ion, but traditional unison is a variation of mono mode which stacks all voices. Some synths offer a variation which plays in poly mode and dynamically adjusts the number of voices stacked depending on how many notes are held. Both modes will sound the same if you only play one key.

at least you should hear some phasing difference when detuning/spreading the different oscillators.
afcourse the effect will sound different on analog oscillators as they are slightly detuned and drifting all the time

slightly OT (different synth) but I can assure you, especially through amplification I can hear a *major* difference when I hit Unison mode on my JP6... 12 analog osc's stacked under one key is enought to stop hearts and burst skulls, with the right filter settings.

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